Apparatus and method for manufacturing vehicle door trim and vehicle door trim manufactured using the method

ABSTRACT

A first mold has a core passage, and first and second cavities in fluid communication with each other at the core passage. A second mold has first and second nozzles therein that inject first and second resins to the first and second cavities, respectively. The core member is slidable within the core passage to provide or block the fluid communication between the cavities, and has a third nozzle therein to inject a third resin to the core passage. The first and second resins are injected into the cavities. The core member is moved to block the fluid communication between the cavities, before injecting the first and second resins is completed. The third resin is injected while moving the core member to provide the fluid communication, after injecting the first and second resins is completed. The molds are separated, thereby yielding a single molded product, such as a vehicle door trim.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is based on, and claims priority from, KoreanApplication Serial Number 10-2007-0131738, filed on Dec. 15, 2007, thedisclosure of which is hereby incorporated by reference herein in itsentirety.

FIELD OF THE INVENTION

The present invention relates to a vehicle door trim, and to anapparatus and method for manufacturing the trim.

BACKGROUND OF THE INVENTION

A typical vehicle door includes an inner and an outer panel, welded toeach other at several positions where the panels overlap. The door alsoincludes a trim fastened to the inner panel, such as with clips.

A typical trim is made of injection molded plastic in several pieces,e.g. an upper trim, a lower trim, a central trim, an inside handlegarnish, and the like, which are then thermally bonded or screwedtogether. This is time consuming and may require several injectionmolding machines.

The above information disclosed in this Background section is only forenhancement of understanding of the background of the invention andtherefore it may contain information that does not form the prior artthat is already known in this country to a person of ordinary skill inthe art.

SUMMARY OF THE INVENTION

An apparatus includes first and second molds and a core member. Thefirst mold has therein a core passage, and first and second cavities influid communication with each other at the core passage. The second moldhas first and second nozzles disposed therein that inject first andsecond resins to the first and second cavities, respectively. The coremember is slidable within the core passage to provide or block the fluidcommunication between the cavities, and has a third nozzle therein toinject a third resin to the core passage. The apparatus may also includea heater near the core passage to heat the resins. The core member mayinclude a core body with the third nozzle therein; and a core plug at anend of the core body, to block the fluid communication between thecavities.

In a method, first and second resins are injected into first and secondcavities in a first mold, through first and second nozzles,respectively, while the first mold and a second mold are closed. Thefirst and second cavities are in fluid communication with each other ata core passage in the first mold. A core member is moved within the corepassage to block the fluid communication between the cavities, beforeinjecting the first and second resins is completed. A third resin isinjected through a third nozzle in the core member while moving the coremember to provide the fluid communication between the cavities, afterinjecting the first and second resins is completed. The first and secondmolds are separated after a cooling time, thereby yielding a singlemolded product, such as a vehicle door trim. The resins may further beheated during injecting of the third resin. The first and second resinsmay be different colors.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of the nature and objects of the presentinvention, reference should be made to the following detaileddescription with the accompanying drawings, in which:

FIG. 1 is a perspective view of an exemplary door trim; and

FIGS. 2 to 4 are cross-sectional views illustrating an exemplaryapparatus and method for manufacturing the door trim of FIG. 1.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Preferred embodiments of the present invention will be described belowwith reference to accompanying drawings.

As shown in FIG. 1, a plastic, injection molded vehicle door trim 1includes several pieces, such as an upper door trim 1 a, a lower doortrim 1 b, a central door trim 1 c, and a door inside handle garnish 1 d.Two or more of these pieces may be made simultaneously using one mold.

Referring to FIG. 2, an apparatus for manufacturing the door trimincludes a stationary mold 10, a movable mold 40, a core member 60, acontroller 70, and a heater 80.

A first cavity 11 and a second cavity 13 are defined on stationary mold10, adjacent to each other. The inner ends of both cavities 11 and 13are open. A core passage 15 in stationary mold 10 fluidly connects theopen ends of the cavities 11 and 13.

First and second nozzles 20 and 30, which are used to inject first andsecond molten resins 21 and 31 (which may, for example, have differentcolors) to first and second cavities 11 and 13, respectively, areprovided in movable mold 40.

Core member 60 slides along core passage 15 to close the open ends ofthe cavities 11 and 13.

A third nozzle 50, in core member 60, injects a third molten resin 51.For this purpose, core member 60 includes a core body 61 and a core plug63. The core body slides along core passage 15 without interfering withstationary mold 10, and is integral with third nozzle 50. The core plugis provided at an end of core body 61, and moves along core passage 15to close the open ends of the cavities 11 and 13 while the outerperipheral surface of the core plug is in airtight contact with corepassage 15.

Heater 80 is provided on the side of core passage 15. Heater 80 mayinclude a heating coil surrounding core passage 15. The heater 80 isoperated by electrical power that is supplied according to the controlof controller 70, and simultaneously preheats first to third moltenresins 21, 31, and 51 so that third molten resin 51 is evenly mixed withfirst and second molten resins 21 and 31 and connects first molten resin21 with second molten resin 31.

Controller 70 controls the operation of movable mold 40, first to thirdnozzles 20, 30, and 50, and core member 60. Further, the controllercontrols the supply of electrical power to heater 80.

An exemplary method of manufacturing a vehicle door trim will bedescribed below with reference to FIGS. 1 to 4.

When stationary mold 10 and movable mold 40 are closed as shown in FIG.2, first and second molten resins 21 and 31 are simultaneously injectedinto first and second cavities 11 and 13 through first and secondnozzles 20 and 30.

Until the injection of first and second molten resins 21 and 31 iscompleted, core member 60 is positioned below core passage 15 as shownin FIG. 2.

Immediately before the injection of first and second molten resins 21and 31 is completed, core member 60 is moved upward along core passage15 as shown in FIG. 3 and simultaneously closes up the opened ends offirst and second cavities 11 and 13 by using core plug 63.

Then, core member 60 gradually moves downward as shown in FIG. 4, whilesimultaneously injecting third molten resin 51 through third nozzle 50,which mixes with first and second molten resins 21 and 31 as they flowout from the open ends of first and second cavities 11 and 13. Heater 80then heats the molten resins 21, 31, and 51 so that third molten resin51 is evenly mixed with first and second molten resins 21 and 31 andconnects first molten resin 21 with second molten resin 31.

Stationary mold 10 and movable mold 40 are then separated from eachother after a predetermined cooling time. Then, a worker pulls out themolded product from first and second cavities 11 and 13.

The product includes two parts integrally connected without the need fora separate assembly member or process. For example, one product mayinclude an upper door trim 1 a and a lower door trim 1 b, which may bedifferent colors. Another product, including a central door trim 1 c anda door inside handle garnish 1 d, may be made by the same method, andthermally bonded or screwed with the first product (upper door trim 1 aand lower door trim 1 b).

Alternatively, all four parts may be molded together by the method, bysimple modifications to the described embodiments that will be apparentto those of ordinary skill in the art, based on the teachings herein.

While this invention has been described in connection with what ispresently considered to be practical exemplary embodiments, it is to beunderstood that the invention is not limited to the disclosedembodiments, but, on the contrary, is intended to cover variousmodifications and equivalent arrangements included within the spirit andscope of the appended claims.

1. A method, comprising: simultaneously injecting first and secondresins into first and second cavities disposed in a first mold, throughfirst and second nozzles, respectively, while the first mold and asecond mold are closed, wherein the first and second nozzles supply thefirst and second molten resins independently to each of the first andsecond cavities and wherein a core passage is disposed downstream thefirst and second cavities to receive the first and second resins flowingtherein; moving a core member within the core passage to block a fluidcommunication between the downstream portions of the first and secondcavities, before injecting the first and second resins is completed;injecting a third resin through a third nozzle formed in the core memberwhile moving the core member to provide the fluid communication ofresins between downstream portions of the first and second cavitiesafter injecting the first and second resins is completed to mix thefirst, second and third molten resin in the core passage; and separatingthe first and second molds after a cooling time, thereby yielding asingle molded product.
 2. The method as defined in claim 1, furthercomprising heating the resins during injecting of the third resin. 3.The method as defined in claim 1, wherein the first and second resinscomprise different colors.